Prior studies have indicated that babies born to older women have higher risks of birth defects, low birth weight and certain chromosome problems, such as Down syndrome.
Botswana is a great success story for Africa to reach this low level of infection among children born to HIV-positive women.
博茨瓦纳能实现如此低的艾滋病毒母婴传播水平，可以称得上是非洲的一个成功典范。
3
Knowing how many people are born or have died, and from which causes, is vital information and yet many low-income countries do not have a well functioning health information system.